JPH02145068A - Television monitor system - Google Patents

Abstract

PURPOSE:To simplify the installation work of signal wires and to reduce the cost by crossover-connecting plural television camera units and driving each television camera unit from a monitor television receiver selectively. CONSTITUTION:When a camera selection switch 1c of a power adaptor 1 is operated to select a camera to display a video, a code signal of a corresponding camera is sent repetitively to a signal line l for each vertical synchronizing signal (each field) for a period when no video signal is outputted by a synchronizing signal outputted from a synchronizing signal generating circuit. The video signal is amplified by a video signal amplifier circuit AMP of the power adaptor 1 and fed to a monitor television set TV through a terminal T2 and the video is displayed till the camera selection switch 1c is switched. When the code signal is changed by the operation of the camera selection switch 1c, a television camera TVC of other television camera unit 3 is driven ad its video is displayed from a monitor television set TV.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television monitor system, and more specifically, the present invention is characterized by connection between a plurality of television camera units and a plurality of monitor televisions and selective driving of the television camera units. Make time for what you have.

[Prior Art] A television monitor system is known in which a monitor television and a television camera unit are connected through a signal line so that outdoor monitoring is performed using an indoor monitor television.

As shown in Figure 8, such a system connects a television camera unit TVC and a monitor television TV with a signal line 1, and a power adapter is installed on the monitor television TV side to supply power to the television camera unit TVC. A television camera unit (100) is provided to display the video signal of the TVC on a monitor television (TV).

However, in such a TV monitor system,
When displaying images sent from multiple TV camera units TVC on -1 monitor TV by switching,
As shown in FIG. 9, a camera switch 101 is provided on the monitor TV side to switch the camera that is to display images, and a power adapter 100 is required for each TV camera unit (TVC). Above, signal line l
It is necessary to install each of them separately, making the installation work large-scale and increasing costs.

The system shown in Fig. 9 can be further advanced to transmit images from multiple television camera units TVC to multiple monitors.
If you want to monitor the TV camera units simultaneously, as shown in Figure 10, each TV camera unit TVC1 signal line l
, it is necessary to prepare multiple systems equipped with a power adapter 100 and a monitor TV, and as in the above case, the installation work is large-scale and the cost is also high. Therefore, it is desirable to simplify the installation work and reduce the cost. The development of a system that can do this is awaited.

[Problems to be Solved by the Invention] The present invention, proposed to solve the above problems, connects a plurality of television camera units across and selectively drives each television camera unit from the monitor television side. By switching and displaying images from multiple TV camera units on a monitor TV, or simultaneously displaying images from multiple TV camera units on multiple monitor TVs, signal line installation work is simplified and costs are reduced. The purpose is to provide a television monitor system.

[Means for Solving the Problems] The present invention according to claim 1 proposed to achieve the above object provides a television monitor configured by connecting a plurality of television camera units and a monitor television with a signal line. The system includes: a power source that supplies DC power to the television camera unit; a video signal amplification circuit that amplifies a video signal from the television camera; a camera selection switch that selects the television camera unit; and a synchronization signal generation circuit; A power adapter having a code signal generation circuit that generates a code signal for selectively driving the television camera unit selected by the camera selection switch in synchronization with the synchronization signal is connected to the monitor television and the signal line. The plurality of television camera units are installed between the
A television camera, a power supply separation circuit that separates and outputs the DC power transmitted superimposed on the signal line, a video signal transmission circuit that sends the video signal to the signal line, and a code signal that discriminates the code signal. and a code signal discrimination circuit for driving a television camera, the plurality of television camera units are cross-connected by the signal line, and the television camera unit is selected according to the operation of the camera selection switch of the power adapter. The present invention according to claim 2 provides a television monitor system configured by connecting a plurality of television camera units and a plurality of monitor televisions with a signal line. , a power source that supplies DC power to the plurality of television camera units, a video signal amplification circuit that amplifies video signals transmitted from the plurality of television camera units at regular intervals, and the plurality of television camera units. a memory for updating and storing video signals transmitted from the television camera unit at regular intervals when the unit is selectively driven;
a synchronization signal generation circuit that generates a synchronization signal that selectively drives the television camera unit in synchronization with the television camera unit at regular intervals; a code signal generation circuit that generates a code signal that selectively drives the television camera unit in accordance with the synchronization signal; The video signal from the camera unit and the output of the above memory,
A television adapter having a changeover switch that automatically switches and outputs to a compatible TV monitor in synchronization with the synchronization signal, and a changeover signal generation circuit that outputs a changeover signal that controls the changeover switch at regular intervals, The plurality of television camera units are provided between the plurality of monitor televisions and the signal line, and each of the plurality of television camera units includes a power separation circuit that separates and outputs the DC power transmitted in a superimposed manner on the television camera and the signal line; The television camera unit is provided with a video signal transmission circuit that sends a video signal to the signal line, and a code signal discrimination circuit that discriminates the code signal and drives the television camera, and the television camera unit is connected by the signal line. During the period in which the video signal transmitted from one television camera unit selected by the above code signal is output to the corresponding monitor television and stored in the corresponding memory, the other monitor televisions are stored in the corresponding memory. The television camera unit and the monitor television to be driven are configured to sequentially change according to the circulation of the code signal. The interval is 1 of the video signal.
The configuration is defined for each line, one field, or one frame, and the present invention according to claim 4 is further characterized in that the video signal transmission circuit of the television camera unit is configured with a current control type circuit, and The code signal discrimination circuit is composed of a high input impedance circuit.

[Function] In the present invention as set forth in claim 1, one power adapter is provided between the monitor television and the signal line, and when the camera selection switch of the power adapter is operated, the synchronization signal generation circuit outputs a signal. Due to the synchronization signal, during the period when no video signal is being transmitted, the code signal of the TV camera unit selected at regular intervals is transmitted from the code signal generation circuit to multiple signal lines connected between the TV camera units. transmitted to the television camera unit.

This code signal is compared with the code unique to the TV camera unit in the code signal discrimination circuit of the TV camera unit, and the TV camera with the matching code is energized and driven, and the video signal is transmitted to the power adapter via the signal line. The signal is amplified by a signal amplification circuit, and the image is displayed on a television monitor. The video output from the television camera continues until the camera selection switch is used to change the television camera unit that displays the video.

Further, in the present invention as set forth in claim 2, one television adapter is provided between the 71H monitor television and the signal line, and the video signal is transmitted by the synchronization signal generation circuit of the television adapter. During this period, a code signal for selecting a television camera unit is transmitted to each television camera unit via a signal line at regular intervals. In a television camera unit that has received a code, the code signal discrimination circuit determines whether the code signal is unique to the television camera unit, and if the codes match, the television camera is driven and the video signal is transmitted at regular intervals. The video signal is amplified by the video signal amplification circuit of the TV adapter via the signal line, and the video signal is stored at regular intervals in the memory corresponding to the TV camera unit.At the same time, the video is manually displayed on the monitor TV. In this case, the constant IFA data stored in the memory is held until the television camera unit is next driven by the circulation of the code signal, and images are output to the monitor television.

Next, when the code signal is circulated by the code signal generation circuit, the corresponding TV camera unit is driven, and the video signal at fixed intervals is stored in the memory corresponding to the TV camera unit, and at the same time, the video is displayed on the corresponding monitor TV. is displayed, and the data in the memory is held until the next drive due to the circulation of the code signal, and the image is displayed on the monitor TV. In other words, the combination of the TV camera and the monitor TV is sequentially selected by the code signal to display images at regular intervals, and the video data stored in the memory is continuously displayed on the monitor TV until the next code signal is selected. It will be output.

Further, the present invention according to claim 3 provides that the certain interval is
It is defined by one line, one field, or one frame of a video signal.Furthermore, in the present invention according to claim 4, the video signal transmission circuit provided in the television camera unit is configured as an IT-style sub-control type, Signals are transmitted by increasing the input impedance of the code signal discrimination circuit.

[Example] The present invention will be described in detail below with reference to the drawings. 1st
The figure and FIG. 2 are block diagrams showing the configuration of the present invention according to claim 1, and in the figure, TV is a monitor television, l is a signal line, l is a power adapter, 2 is a terminator, and 3 is a television. This television camera unit 3 is a camera unit and is connected across by signals Gf and l.

To explain its operation, the DC tff of power adapter 1
E is sent from the terminal TI to the signal line l through a coil L having a high impedance with respect to alternating current, and in the television camera unit 3, the power transmitted through the signal line p is connected to a tR separation circuit having a high impedance with respect to alternating current. 3a
The DC is separated and supplied to the internal circuit.

Here, 'camera selection switch 1c of power adapter l
When you select a camera to display an image by operating , the synchronization signal output from the synchronization signal generation circuit causes the code signal of the corresponding camera to be synchronized every vertical synchronization signal during the period when no video signal is being output. It is repeatedly sent to signal line E (for each field).

This code signal is transmitted to all television camera units 3, and in each television camera unit 3, a code signal discriminating circuit 3c determines whether the code is unique to the television camera unit, and the television camera with the matching code is sent to the television camera unit 3. In the unit, the television camera TVC is energized and the video signal for 1 field is sent to the signal line 1 through the video signal transmission circuit 3b.

This video signal is amplified by the video signal amplification circuit AMP of the power adapter 1, and is sent to the monitor TV via the terminal T2.
In addition to this, the image is displayed until the camera selection switch IC is switched.

Then, when the code signal is changed by operating the camera selection switch lc, the television camera TVC of another television camera unit 3 is driven and the image thereof is displayed on the monitor television TV. In other words, one power adapter 1 can be used to select a plurality of television camera units to display images. In this case, although the figure shows one monitor TV, there are multiple monitor TVs.
Needless to say, it is possible to connect the two and display the same image.

In the above embodiment, a coaxial cable is used for the signal line 1, and the terminator 2 uses a resistor RO that is equal to the characteristic impedance ZO of the coaxial cable and a capacitor CO that blocks the DC component connected in series. There is. Further, as shown in FIG. 3, the video signal transmission circuit 3b is composed of a transistor Q, resistors R1, R2, and R3, and has a gain of (ZO/2)/R.
3, and the code signal discrimination circuit 3c is configured to have a high input impedance to improve transmission reliability (corresponding to claim 4).

Furthermore, as shown in Figure 4, the code signal is configured to be output from the signal line 1 in synchronization with the vertical blanking signal during a period that does not affect the video signal, such as the vertical blanking period. It is said that

Next, FIGS. 5 and 6 show an embodiment of the present invention as set forth in claim 2, in which the power adapter 1 of the above embodiment is replaced with a television adapter 4,
The difference is that two units are provided, and the other configurations are the same, so the same reference numerals are given and the explanation will be omitted.

The television adapter 4 of this embodiment has a synchronization signal generation circuit 4.
a, a code signal generation circuit 4b that outputs one code signal to the signal line p during a period when the synchronization signal does not affect the image of the video signal, and a switching signal for controlling the changeover switch SW using the synchronization signal. A switching signal generating circuit 4c to output, field memories 4d and 4d' storing video signals for one field to be transmitted corresponding to each of the television camera units 31 and 32, and a television camera unit) 31. 32, a coil exhibiting high impedance to alternating current, and a video signal amplification circuit AMP that amplifies the video signal.

This operation will be explained with reference to the timing chart of FIG.

In the figure, when the code signal of the television camera unit 31 is sent to the signal line l through the terminal T1 during a period in which it does not affect the video signal by the synchronization signal generated by the synchronization signal generation circuit 4a, the television camera unit 31 .32
The code discrimination circuit 3C discriminates the code signal, and in the television camera unit 31 where the codes match, the television camera TV C1 is energized, and the video signal l for l fields is sent to the signal line through the video signal transmission circuit 31b. (See FIGS. 7(a) to (C)).

This video signal 1 is amplified by the video signal amplification circuit AMP of the television adapter 4 and stored in the memory 1 (4d), and at the same time, the changeover switch SW is connected to the b side by the changeover signal generation circuit 4C. Therefore, an image is displayed on the monitor television TVI through the terminal T2 (FIGS. 7(e) and 7(f)).

(see (h)).

In this case, the video signal 1 is also applied to the memory 2 (4d'), but since data sampling is not performed in the memory 2 (4d'), the data is not M-changed.

Next, in synchronization with the synchronization signal, the code signal generation circuit 4b outputs the code signal of the television camera unit 32 to the signal line -i.
In the television camera unit 32, this code is determined by the code signal discrimination circuit 32c, the television camera TVC2 is driven, and the video signal 2 corresponding to 1 field is sent out to the signal line through the video signal transmission circuit 32b. (See Figure 7(a)L(b),(d)).

This video signal 2 is amplified by the video signal amplification circuit AMP of the television adapter 4 and stored in the memory 2 (4dl).
Since the changeover switch SW is switched to the side a by c, the video 2 is displayed on the monitor TV 2 (FIG. 7(e)).

(g), see (i)).

In this case, since memory 1 (4d) does not perform data sampling, data for one field of video 1 is continuously transmitted from memory 1 (4d) to monitor television TVI.

In this way, when the television camera unit 31 is being driven, its video signal is output to the monitor television TVI, and the monitor television TV2 is stored in the memory 2 (4d').
The video of the previous field stored in the memory 2 is continuously outputted to the monitor TV TV2, and when the TV camera unit 31 stops driving and the TV camera unit 32 is driven, the video signal is transferred to the memory 2 ( 4d') and displayed on the monitor TV TV2 at the same time, the data of the previous field stored in the memory 1 (4d) is output to the monitor TV TVI, and the previous image is continuously output. and two TV camera units 3
1. Divide the video signal from 32 into 2 fields.
The monitors TV1 and TV2 are switched to each other for transmission, and in the interval where the video signal is not being transmitted, the video for 1 field stored in the memory is displayed (Figure 7 (h) (1) #Sho).

In this embodiment, the case where there are two television camera units and two monitor televisions has been explained, but if the number of television camera units and monitor televisions is increased by increasing the number of memories and the number of contacts of the changeover switch. Also, it becomes possible to simultaneously project and monitor images from multiple television submersible cameras on multiple monitor televisions. Furthermore, although the above embodiment shows an example in which the video signal is stored in the memory for each field, it is also possible to store data in the memory for each line or frame of the video signal and display the data on a monitor television. It is possible (corresponding to claim 3).

[Effects of the Invention] According to the present invention as set forth in claim 1, a plurality of television camera units are connected across the line 1g, and each television camera unit is selectively driven by one power adapter provided on the monitor television side. Since it is possible to switch and display images from multiple TV camera units on the monitor TV, the length of the signal line is reduced compared to the case where multiple TV cameras and the monitor TV are connected by signal lines respectively. In addition, since the signal line installation work is simplified and only one power adapter is provided, it is possible to provide a television monitor system with a simplified system configuration and reduced costs. According to the present invention described, it is possible to switch and display images from multiple TV camera units that are connected across to multiple TV monitors using one TV adapter, and to connect multiple TV camera units and multiple TV monitors. The length of the signal line is significantly reduced compared to the case where separate signal lines are used to connect the two cables, simplifying the signal line installation work, and simplifying the system configuration as only one TV adapter is required. It becomes possible to provide a television monitor system that is simplified and reduced in cost.

Further, according to the present invention as set forth in claim 3, it is possible to change the switching intervals between a plurality of television camera units and the monitor television, and according to the present invention as set forth in claim 4, a television monitor with improved transmission reliability can be obtained. system.

[Brief explanation of the drawing]

1 and 2 are block diagrams showing the configuration of an embodiment of the present invention as set forth in claims 1 and 4, FIG. 3 is an internal circuit diagram of the video signal transmission circuit, and FIG. 4 is a code diagram of the video signal transmission circuit. Waveform diagrams during signal transmission, FIGS. 5 and 6, are shown in claims 2 and 3. 7 is a timing chart illustrating its operation, and FIGS. 8 to 1O are diagrams illustrating the configuration of a conventional television monitor system. . [Description of symbols] 1...Power adapter la, 4a...Synchronization signal generation circuit lb, 4b...Code signal generation circuit lc...Camera selection switch 3.31, 32Φ...TV camera unit 3a, 31
&, 32a...Power separation circuit 3b, 31b, 32b.
...Video signal transmission circuit 3C, 31C132c...Code signal discrimination circuit 4...TV adapter 4c...Switching signal generation circuit 4d...Memo January 4d'...-Memory 2 AMP...Video Signal amplification circuit E...Power supply l◆...Signal line SW...Changing switch TV, TVI, TV2---%: TV TVC. TVCI.

Claims (4)

[Claims] (1) In a television monitor system configured by connecting multiple television camera units and monitor televisions with signal lines, a power source supplies DC power to the television camera units and amplifies the video signal from the television camera. A video signal amplification circuit, a camera selection switch for selecting the television camera unit, a synchronization signal generation circuit, and a code signal for selectively driving the television camera unit selected by the camera selection switch. A power supply adapter having a code signal generation circuit that generates a code signal in synchronization with the above is provided between the monitor television and the signal line, and each of the plurality of television camera units is superimposed on the television camera and the signal line. a power supply separation circuit that separates and outputs the DC power that is transmitted as a signal, a video signal transmission circuit that sends the video signal to the signal line, and a code signal discrimination circuit that determines the code signal and drives the television camera. The plurality of television camera units are cross-connected by the signal line, and the television camera units are selectively driven in accordance with the operation of the camera selection switch of the power adapter to project images on the monitor television. A television monitor system characterized by: (2) In a television monitor system configured by connecting a plurality of television camera units and a plurality of monitor televisions with a signal line, a power supply that supplies DC power to the plurality of television camera units, and a plurality of television camera units. a video signal amplification circuit that amplifies video signals transmitted from the TV camera unit at regular intervals, and corresponding to each of the plurality of television camera units,
A memory that updates and stores the video signal transmitted from the television camera unit at regular intervals when the unit is selectively driven; and a synchronization signal that synchronizes and selectively drives the television camera unit at regular intervals. a code signal generation circuit that generates a code signal for selectively driving a television camera unit according to the synchronization signal; and a code signal generation circuit that generates a code signal for selectively driving a television camera unit according to the synchronization signal; A television adapter that has a changeover switch that synchronizes and automatically switches and outputs to the corresponding monitor television, and a changeover signal generation circuit that outputs a changeover signal that controls the changeover switch at regular intervals, can be used to connect the plurality of monitors. The plurality of television camera units are provided between the television and the signal line, and each of the plurality of television camera units includes a television camera, a power separation circuit that separates and outputs the DC power that is transmitted superimposed on the signal line, and a power separation circuit that separates and outputs the DC power that is transmitted superimposed on the signal line. It is equipped with a video signal transmission circuit that transmits the video signal to the signal line, and a code signal discrimination circuit that discriminates the code signal and drives the television camera, and the television camera unit is cross-connected by the signal line and receives the code signal. During the period in which the video signal transmitted from one TV camera unit selected by A television monitor system, characterized in that the television camera unit and the monitor television to be driven are sequentially changed by the circulation of the code signal. (3) The television monitor system according to claim 2, wherein the certain interval is defined for each line, field, or frame of the video signal. (4) Claim 1 or 2, wherein the video signal transmission circuit of the television camera unit is comprised of a current control type circuit, and the code signal discrimination circuit is comprised of a high input impedance circuit. TV monitor system described in.